No sound on macbook; concern

Ok, I have black macbook from 2007. I love it and wish they bring back the black for one of the computer product lines. I would buy it instantly.

Anyways, I was looking up some stuff about men's health for research. I did go to websites that I was unfamiliar with but looked at the links to see if it was worthy.
After I was done with that, I went to listening to music on youtube. I played a song and it would play without sound. I tried a different video, no sound. I tried a different website, still no sound. While traveling to the different sites I would a beach ball momentarily. I was able to get to the site. I reset safari, then restarted my computer.
It didnt work still. Then I went to youtube, and it started working. No beachball lately. But now, the song or video will pause or skip for a second then continue.
It has gotten me really worried and suspicious. I had all kinds of problems and virsuses with my last pc. This is my first apple, its one of the reasn i switched. I didnt have problems until now.

wow, this is very not normal. When the sound pauses, the video freezes as well even when the sound continues but then returns to normal. I'm gonna have to confirm myself that I have a virus or a worm. It's very upsetting that this has happened to me. I tried very hard to prevent such problems yet they still occur on an apple computer...

wow, this is very not normal. When the sound pauses, the video freezes as well even when the sound continues but then returns to normal. I'm gonna have to confirm myself that I have a virus or a worm. It's very upsetting that this has happened to me. I tried very hard to prevent such problems yet they still occur on an apple computer...

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